Aldo is a Member of the Malta Institute of Accountants and a Member of the Malta Institute of Taxation. Mr. Zammit began his career in 1997 with the accountancy and auditing firm Grant Thornton. He started off in the accountancy department and later joined the audit team where he gained exposure to various assignments at both a local and a foreign level.

In 2001 Mr. Zammit joined the Tax Compliance Unit (TCU) within the Ministry of Finance in Malta, during which he gained considerable knowledge regarding the area of taxation. He resigned from the TCU to join KSi Malta in 2008 and was appointed to manage and supervise the audit staff. Mr. Zammit was appointed partner in 2010.